LVM

Create

This example creates an LVM logical volume called new_logical_volume that consists of the disks at /dev/sda1, /dev/sdb1, and /dev/sdc1.

5.1.1. Creating the Physical Volumes

[root@tng3-1 ~]# pvcreate /dev/sda1 /dev/sdb1 /dev/sdc1
  Physical volume "/dev/sda1" successfully created
  Physical volume "/dev/sdb1" successfully created
  Physical volume "/dev/sdc1" successfully created

5.1.2. Creating the Volume Group

The following command creates the volume group new_vol_group.

[root@tng3-1 ~]# vgcreate new_vol_group /dev/sda1 /dev/sdb1 /dev/sdc1
  Volume group "new_vol_group" successfully created

You can use the vgs command to display the attributes of the new volume group.

[root@tng3-1 ~]# vgs
  VG            #PV #LV #SN Attr   VSize  VFree
  new_vol_group   3   0   0 wz--n- 51.45G 51.45G

5.1.3. Creating the Logical Volume

The following command creates the logical volume new_logical_volume from the volume group new_vol_group. This example creates a logical volume that uses 2GB of the volume group.

[root@tng3-1 ~]# lvcreate -L2G -n new_logical_volume new_vol_group
  Logical volume "new_logical_volume" created

5.1.4. Creating the File System

The following command creates a GFS file system on the logical volume. np:

[root@tng3-1 ~]# gfs_mkfs -plock_nolock -j 1 /dev/new_vol_group/new_logical_volume
This will destroy any data on /dev/new_vol_group/new_logical_volume.

Are you sure you want to proceed? [y/n] y

Device:                    /dev/new_vol_group/new_logical_volume
Blocksize:                 4096
Filesystem Size:           491460
Journals:                  1
Resource Groups:           8
Locking Protocol:          lock_nolock
Lock Table:

Syncing...
All Done

The following commands mount the logical volume and report the file system disk space usage.

[root@tng3-1 ~]# mount /dev/new_vol_group/new_logical_volume /mnt
[root@tng3-1 ~]# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/new_vol_group/new_logical_volume
                       1965840        20   1965820   1% /mnt 

Rozszerzenie Phisical volume  

echo 1 > /sys/block/sdX/device/rescan

[root@centos7 ~]# pvs
  PV         VG           Fmt  Attr PSize   PFree
  /dev/sda2  centos       lvm2 a--   59.51g 64.00m
  /dev/sdb   vol_group_sk lvm2 a--  160.00g 10.00g
[root@centos7 ~]# pvresize /dev/sdb
  Physical volume "/dev/sdb" changed
  1 physical volume(s) resized / 0 physical volume(s) not resized
[root@centos7 ~]# pvs
  PV         VG           Fmt  Attr PSize   PFree
  /dev/sda2  centos       lvm2 a--   59.51g 64.00m
  /dev/sdb   vol_group_sk lvm2 a--  210.00g 60.00g
[root@centos7 ~]#

Rozszerz LVM logical volume

# lvextend -L12G /dev/myvg/homevol
 
 
Najpierw zrób:
e2fsck -f /dev/myvg/homevol/dev/myvg/homevol 

 

ext2/ext3
          

umount /dev/myvg/homevol/dev/myvg/homevol
   # resize2fs /dev/myvg/homevol         # wykonuj na zamontowanym zasobie 
   # mount /dev/myvg/homevol /home

 umount /dev/myvg/homevol/dev/myvg/homevol
   # ext2resize /dev/myvg/homevol       # wykonuj na zamontowanym zasobie 
   # mount /dev/myvg/homevol /home

 
xfs

mount /dev/myvg/homevol /home

xfs_growfs /home        # wykonuj na zamontowanym zasobie 
 
df -h  
 
 
Rozszerz LVM volume group
 
vgextend new_vol_group /dev/sdd



  

 Usuń uszkodzony dysk z volume group

# pvs -o+pv_used
Sprawdz zajętość dysków

# pvmove /dev/sdb1
przenieść dane z dysku do wymiany
/dev/sdb1: Moved: 2.0% ...
/dev/sdb1: Moved: 79.2% ...
/dev/sdb1: Moved: 100.0%

# pvs -o+pv_used
 Sprawdz zajętość dysków
 
# vgreduce myvg /dev/sdb1
Wypnij dysk z grupy